Merge pull request #98 from jemc/master

Problem: No way to model arbitrary private headers
Problem: lack support for zproto state machine animation

The zproto server/client state machines provide an animation option
which shows the state transitions. This is helpful for debugging any
errors in the state machines. This is enabled by passing -v to the
selftest (which passes a verbose argument to server/client classes).

Solution: add 'make animate' target that does a 'make check' with
verbose option.
Merge pull request #99 from hintjens/master

Problem: lack support for zproto state machine animation
Problem: The need of a license.xml isn't mentioned in the README
Solution: Explain how to include a license and what it is used for
Problem: Forgot to generate README.txt in README.md
Solution: use gitdown to generate it
Problem: Can't find .7 man page

Obnly this one is searched for in srcdir while still being generated
from txt file and thus being in builddir. Removing srcdir reference as
it breaks out of the tree build of czmq.
Merge pull request #101 from miska/master

Problem: Can't find .7 man page